Adafruit
ADS122C04 24-Bit 4-Channel I2C ADC Breakout
· MPN: ADA6432
This breakout is built around TI's ADS122C04, a high-resolution analogue-to-digital converter that lets you measure very small single-ended or differential s...
This breakout is built around TI's ADS122C04, a high-resolution analogue-to-digital converter that lets you measure very small single-ended or differential signals over I2C. It offers 24-bit conversion with data rates up to 2 kSPS on one channel, making it a strong fit for scientific, industrial, and general data-acquisition jobs where you need more precision than common 16-bit I2C ADCs.
The board exposes four analogue inputs that can be used as two differential pairs or four single-ended channels, along with a reset pin, an internal temperature sensor, an internal 2.048 V reference, external positive and negative reference inputs, and programmable gain up to 128x. It supports both 3 V and 5 V power and logic levels, and the two address pins let you run up to four boards on the same I2C bus.
Adafruit has laid it out in the STEMMA QT form factor, with connectors on both sides that are also compatible with SparkFun Qwiic cables for quick solderless I2C wiring. A strip of 0.1" standard header is included for breadboard or perfboard use, and there are four mounting holes for easier installation in a project. Example code is provided for Raspberry Pi, Arduino, and CircuitPython.
If you want to reach the full 2 kSPS rate, you'll need to run the I2C bus at 1 MHz and be able to process the incoming data quickly. It's a handy option for precision sensing, test setups, and custom instrumentation with everything from Arduino-compatible boards to Raspberry Pi.
Specifications:
- Chip Current Consumption: as Low as 315 µA (typ)
- Wide Supply Range: 2.3 V to 5.5 V
- Programmable Gain: 1 to 128
- Programmable Data Rates: Up to 2 kSPS
- Effective Resolution: Up to 20 Bits
- 50-Hz and 60-Hz Rejection: Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS With Single-Cycle Settling Digital Filter
- Inputs: Two Differential or Four Single-Ended Inputs
- Dual-Matched Programmable Current Sources: 10 µA to 1.5 mA
- Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
- Oscillator: Internal 2% Accurate Oscillator
- Internal Temperature Sensor: 0.5°C (typ) Accuracy
- Interface: I2C-Compatible Interface
- Supported I2C Bus Speed Modes: Standard-Mode, Fast-Mode, Fast-Mode Plus
- Product Dimensions: 25.5mm x 17.7mm x 4.7mm / 1.0" x 0.7" x 0.2"
- Product Weight: 1.6g / 0.1oz
Jargon buster
Plain-language definitions for the technical terms used above.
- ADS122C04
- A Texas Instruments analogue-to-digital converter chip that measures small analogue voltages and reports them digitally over I2C. The exact chip matters because it sets the board’s resolution, input options, speed, and software support.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- digital filter
- Built-in processing that smooths or rejects unwanted parts of the measured signal after conversion. This matters when measuring slow or noisy signals, such as sensors affected by mains hum or electrical interference.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- kSPS
- kSPS means thousands of samples per second, describing how many readings an ADC can take each second. It matters when choosing a board for fast-changing signals, because slow sensors do not need a high sample rate but audio-like or rapidly varying signals may.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- programmable gain
- An adjustable amplification setting inside the ADC that makes small input signals larger before they are measured. It matters because choosing the right gain helps use more of the ADC’s range without overloading the input.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- SPS
- Samples per second, meaning how many measurements the converter can make each second. Higher SPS gives faster updates, while lower SPS on this board allows higher-resolution readings.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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ADS122C04 Datasheet
Datasheet · 2.2 MB · Click any page to view full size
Supplier page — adafruit.com
Supplier Description · 708.7 KB · Click any page to view full size
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